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RSS -119 — Radio Transmitters and Receivers Operating in the Land Mobile and Fixed Services in the Frequency Range 27.41-960 MHz

5. Transmitter and Receiver Specifications (Continued)

5.8 Transmitter Unwanted Emissions (Continued)

5.8.9 Emission Mask for Equipment in the Bands 764–776 MHz and 794–806 MHz

5.8.9.1 Adjacent Channel Power (ACP)

The ACP of transmitters operating in the bands 764–776 MHz and 794–806 MHz shall comply with the requirements in the following tables for various transmitter channel sizes. Mobile station requirements apply to handheld, car-mounted and control station units. The tables specify a maximum value for the ACP relative to the maximum output power as a function of the displacement, fd, from the channel centre frequency. In the tables, "(s)" indicates that a swept measurement may be used.

Table 12 – 6.25 kHz Transmitter ACP Requirements
Displacement Frequency, fd
(kHz)		 Maximum Relative ACP (dBc) Measurement Bandwidth
(kHz)
Mobile Station Base Station
6.25 –40 –40 6.25
12.50 –60 –60
18.75
25.00 –65 –65
37.50 –65 –65 25.00
62.50
87.50
150.00 –65 –65 100.00
250.00
350.00
400 < fd = 12 MHz –75 –80 30(s)
12 MHz < fd = paired receive band
In the paired receive band –100 –100
Table 13 – 12.5 kHz Transmitter ACP Requirements
Displacement Frequency, fd
(kHz)		 Maximum Relative ACP (dBc) Measurement Bandwidth
(kHz)
Mobile Station Base Station
9.375 -40 -40 6.25
15.625 -60 -60
21.875
37.50 -60 -60 25.00
62.50 -65 -65 25.00
87.50
150.00 -65 -65 100.00
250.00
350.00
400 < fd = 12 MHz -75 -80 30(s)
12 MHz < fd = paired receive band
In the paired receive band -100 -100
Table 14 – 25 kHz Transmitter ACP Requirements
Displacement Frequency, fd
(kHz)		 Maximum Relative ACP (dBc) Measurement Bandwidth
(kHz)
Mobile Station Base Station
15.625 -40 -40 6.25
21.875 -60 -60 6.25
37.50 -60 -60 25.00
62.50 -65 -65 25.00
87.50 25.00
150.00 -65 -65 100.00
250.00
350.00
400 < fd = 12 MHz -75 -80 30(s)
212 MHz < fd = paired receive band
In the paired receive band -100 -100
Table 15 – 50 kHz Transmitter ACP Requirements
Displacement Frequency, fd
(kHz)		 Maximum Relative ACP (dBc) Measurement Bandwidth
(kHz)
Mobile Station Base Station
50 -40 -40 50
100 -50 -50
150
200
250
300 -55
350
400 -60
450
500
550
600 = fd < 1 000 -60 -65 30(s)
1 000 = fd < 2 000 -65 -70
2 000 = fd < 9 000 -70 -75
9 000 = fd < paired receive band
In the paired receive band -100 -85  
5.8.9.2 Out-of-band Emission Limit

On any frequency outside of the ranges specified in the ACP tables 12 to 15, the power of any emission shall be attenuated below the mean output power P (dBW) by at least 43 + 10 log10(p), measured in a 100 kHz bandwidth for frequencies less than 1 GHz, and in a 1 MHz bandwidth for frequencies greater than 1 GHz.

In addition, for operations in the 764–776 MHz and 794–806 MHz, all emissions (including harmonics in the band 1559–1610 MHz), shall not exceed -70 dBW/MHz e.i.r.p. for wideband emissions, and -80 dBW/kHz e.i.r.p. for discrete emissions of less than 700 Hz bandwidth.

5.8.10 Emission Mask Y for Equipment with a 25 kHz Channel Spacing and an Occupied Bandwidth greater than 20 kHz

Equipment with a 25 kHz channel spacing and an occupied bandwidth greater than 20 kHz shall have the power of any emission attenuated below the transmitter output power P (dBW) as specified in Table 16.

Table 16 – Emission Mask Y
Displacement Frequency, fd
(kHz)		 Minimum Attenuation
(dB)		 Resolution Bandwidth (Hz)
12.375 < fd ≤ 13.975 whichever is the lesser attenuation:
30 + 16.67(fd-12.375) or
55 + 10 log10(p)		 Specified in Section 4.2.2
fd > 13.975 whichever is the lesser attenuation:
57 or
55 + 10 log10(p)		 Specified in Section 4.2.2

5.9 Transient Frequency Behaviour

When a transmitter is turned on, the radio frequency may take some time to stabilize. During this initial period, the frequency error or frequency difference (i.e. between the instantaneous and the steady state frequencies) shall not exceed the limits specified in Table 17.

Any suitable method of measurement can be used provided that it is fully described in the test report. A suitable and recommended method is given in TIA Standard 603.

Table 17 – Transient Frequency Behaviour
Channel Spacing (kHz) Time Intervals 1, 2 Maximum Frequency Difference (kHz) Transient Duration Limit (ms)
138–174
MHz		 406.1–512
MHz
Footnotes
  1. back to footnote reference 1
    • ton: the instant when a 1 kHz test signal is completely suppressed, including any capture time due to phasing.
    • t1: the time period immediately following ton.
    • t2: the time period immediately following t1.
    • t3: the time period from the instant when the transmitter is turned off until toff.
    • toff: the instant when the 1 kHz test signal starts to rise.
  2. back to footnote reference 2 If the transmitter carrier output power rating is 6 W or less, the frequency difference during the time periods t1 and t3 may exceed the maximum frequency difference for these time periods. The corresponding plot of frequency versus time during t1 and t3 shall be recorded in the test report.
25 t1 ±25 5 10
t2 ±12.5 20 25
t3 ±25 5 10
12.5 t1 ±12.5 5 10
t2 ±6.25 20 25
t3 ±12.5 5 10
6.25 t1 ±6.25 5 10
t2 ±3.125 20 25
t3 ±6.25 5 10

5.10 Transmitters with Output Power not Exceeding 120 mW

Transmitters which have an output power that does not exceed 120 mW are exempt from the spectrum masks of Section 5.8, the transient frequency behaviour of Section 5.9, and the frequency stability limits of Section 5.3 provided that they comply with the following:

The sum of the bandwidth occupied by the emitted signal plus the bandwidth required for frequency stability shall be adjusted so that any emission appearing on a displacement frequency, fd, from the assigned frequency as shown in Table 18 is attenuated below the unmodulated carrier power by at least 30 dB, when measured with a resolution bandwidth of 300 Hz. If the unmodulated carrier power is not available, the modulated transmitter output power can be used instead. The transmitter output power is measured or integrated over its occupied bandwidth.

Table 18 – Displacement Frequency for Required Attenuation for Transmitters Having Output Power Less than 120 mW
Equipment Channel Spacing (kHz) Displacement Frequency, fd (kHz)
fd = 40 25
30
fd = 25 12.5
15
fd = 12.5 6.25
7.5

The frequency stability test as given in RSS-Gen shall be carried out to demonstrate the compliance of attenuation above.

5.11 Receiver Spurious Emissions

Receiver spurious emissions shall comply with the limits specified in RSS-Gen.

5.12 Internal Data Modem Tests

A data modem internal to the radio terminal shall contain level adjustment and pulse-shaping circuitry. The modem shall be tested and shall comply with the mask that is appropriate to the data rate.

5.13 Interoperability Technical Standards for Equipment in the Bands 764–776 MHz and 794–806 MHz

Transmitters operating on those narrowband channels in the bands 764–776 MHz and 794–806 MHz designated for interoperability (see SRSP-511) shall comply with the requirements in the following sections and a statement of declaration of compliance shall be included in the test report.

5.13.1 Voice Operation Equipment

Transmitters designed for voice operation shall include a 12.5 kHz bandwidth mode of operation conforming to the following standards, which are incorporated by reference:

  1. Project 25 – FDMA Common Air Interface – New Technology Standards Project – Digital Radio Technical Standards, Telecommunications Industry Association, TIA-102.BAAA; and
  2. Project 25 – Vocoder Description, Telecommunications Industry Association, TIA-102.BABA.

5.13.2 Data Transmission Equipment

Transmitters designed for data transmission shall include a 12.5 kHz bandwidth mode of operation conforming to the following standards, which are incorporated by reference:

  1. Project 25 – Data Overview – New Technology Standards Project – Digital Radio Technical Standards, Telecommunications Industry Association, TIA-102.BAEA;
  2. Project 25 – Packet Data Specification – New Technology Standards Project – Digital Radio Technical Standards, Telecommunications Industry Association, TIA-102. BAEB;
  3. Project 25 – Radio Control Protocol (RCP) – New Technology Standards Project – Digital Radio Technical Standards, Telecommunications Industry Association, TIA-102. BAEE; and
  4. Project 25 – FDMA Common Air Interface – New Technology Standards Project – Digital Radio Technical Standards, Telecommunications Industry Association, TIA-102. BAAA.
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